Plastic Torsion: An Experimental Determination of the Stress Distribution in a Bar Which Has Been Twisted to the Limit of Plasticity

Abstract Among the locally varying distributions of stress with partial yielding, that of a twisted bar is treated, for which the transition from a state of equilibrium with purely elastic deformations to one with plastic deformations was investigated. An analogy described on an earlier occasion was utilized to determine by an experimental method the distribution of stress in the twisted bar. This distribution of stress was compared with the position of the thin layers of slip observed in the etched cross-sections of twisted steel bars.